Avoid double / in Apache configuration (#1611)

6 jobs for master in 9 minutes and 53 seconds (queued for 18 minutes and 48 seconds)
Status Job ID Name Coverage
  Build
passed #10175
build_bionic

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passed #10174
build_buster

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passed #10173
build_stretch

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  Sign
passed #10176
sign

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  Deploy
passed #10177
pages

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passed pages:deploy

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